Sweet chestnut has been extremely rare if not extinct? in the USA for 50 years since Chestnut blight wiped them out. There is a vastly wider flora over there many times more species of tree in particular, I think you need US tree people to do your IDs.
I would guess bukeye (Aesculus) family the only common one in the UK is horse chestnut Aesculus hippocastanum but there are many in the US.
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